Improvement in adjustable templets for ships  frames



A. P ERRI N.

Adjustable Templates for Ships Frames.

N0. 140,071. Pat-entedJUne17J873 UNITED STATES PATENT OFFICE.

ABRAM PER-BIN, OF MARINE CITY, MICHIGAN.

IMPROVEMENT IN ADJUSTABLE TEMPLETS FOR SHIPS FRAMES.

Specification forming part of Letters Patent No. 140,071, dated J une17, 1873 application filed January 21, 1873.

To all'whom it may concern:

Be it known that I, ABRAM PERRIN, of Marine City, in the county of St.Clair and State of Michi gan, have inven ted anew anduseful Improvementin an Adjustable Templet for Laying Off the Frames of Ships; and I dodeclare that the following is a true and accurate description thereof,reference being had to the accompanying drawings and to the letters ofreference marked thereon and being a part of this specification, inwhich- Figure 1 is a perspective view of my adj ustble templet and Fig.2 is an enlarged longitudinal section of a portion thereof.

This invention has for its object to provide the ship-builder with atemplet which can be adjusted to the width, taper, and curvature of anyships rib drawn on the molding-floor; which can then be tran sierred tothe timber from which the rib or frame is to be made, thereby saving theexpense of the wooden templets usually employed for that purpose. Theinvention consists in the peculiar construction of the device, which iscomposed of abar-link chain, every second link of which carries ametallic loop disposed on alternate sides,

through which loops are passed two strips of sheet metal, which aresecured in any desired form by wedges or keys driven into the loopsbehind them, the whole being arranged as more fully hereinafter setforth.

In the drawing, A represents fiat plates of sheet metal, which areconnected by shorter plates A, hinged to the ends of each pair oflink-plates A to form a chain. To each link A is secured atapered loop,B, projecting from the chain on alternate sides. 0 U are two lightstrips or ribbons, preferably of steel, passed through the two series ofloops B, the former making the face or convex edge of the templet, andthe latter the convex edge thereof. In

the loops behind the strips 0 O a wedge, D,

s driven in each, and holds the strips fast in place. The links Aarelongest at the lower end of the templet, and from thence to the top aregradually shortened.

When the outline of a rib or frame is drawn in chalk on the floor of themolding-loft, a few pins are driven inon the lines, and the templets,with the keys slackened, laid down inside the pins. (Jommencing at thelower end of the drawing, he draws out the strips to its outer and innerlines, following their curvatures, and keys the strips fast as each linkis drawn up to its adjustment, until the top of the drawing is reached.The adjusted templet is now a segment of a trussed arch or curve, and,although 'very light, is rigid, and cannot be easily twisted out ofform. It is now carried to the yard or mill, and laid on the timber fromwhich the rib is to be out, and its outline chalked thereon twice, for apair of ribs of the same size and form are always needed, and, in someparts of the hull, several pairs after which it is carried back and readjusted to the form of the next rib wanted. This enables the ship-builderto save several hundred dollars, which he would otherwise expend forwooden templets to be used as patterns for the frames of each hull hebuilds.

If preferred, the keys or wedges may be replaced by set-screws forfastening the strips to the loops; but the Wedges are preferable onaccount of the greater stiffness they give the structure.

What I claim as my invention, and desire to secure by Letters Patent, is

The adjustable templet for ships frames, composed of the links A A,loops B, flexible strips 0 O, and wedges D, substantially as shown andset forth.

ABBAM PERRIN.

Witnesses H. S. SPRAGUE, H. F. EBERTS.

